Reversibility and dynamic equilibria

2 marks · Easy

The dehydration of hydrated copper(II) sulfate crystals is a reversible reaction:

If 0.50 mol of is heated, how many moles of water are produced? Show your working.

Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.

Show answer

2.5 mol H2O mol (±0.1)

Also accept: 2.5 moles H2O

Common mistakes: Forgetting to multiply by 5; Not writing the unit

Show mark scheme and worked solution

Marking points

M1 · 1 mark · Multiplies 0.50 mol by 5 (for 5 H2O produced per mole).

A1 · 1 mark · Correct answer: 2.5 mol H2O (with unit).

Worked solution

From the equation, 1 mol produces 5 mol .

So, 0.50 mol produces 0.50 × 5 = 2.5 mol .